DVAB2800D Series
HIGH RELIABILITY HYBRID
DC-DC CONVERTERS
DESCRIPTION
The DVAB series of high reliability DC-DC converters
is operable over the full military (-55 °C to +125 °C)
temperature range with no power derating. Unique
to the DVAB series are independent dual control
loops which provide tight regulation and zero cross
regulation error while maintaining high
efficiency. Operating at a nominal fixed frequency of
325 kHz, per stage, these regulated, isolated units
utilize a high speed magnetic feedback design and
well controlled undervoltage lockout circuitry to
eliminate slow start-up problems.
These converters are designed and manufactured in
a facility qualified to ISO9001 and certified to MIL-
PRF-38534 and MIL-STD-883.
This product may incorporate one or more of the
following U.S. patents:
5,784,266
5,790,389
5,963,438
5,999,433
6,005,780
6,084,792
6,118,673
FEATURES
High Reliability
Very Low Output Noise
Wide Input Voltage Range: 15 to 50 Volts per
MIL-STD-704
Dual Outputs with Zero Cross Regulation Error
Up to 15 Watts Output Power
High Input Transient Voltage: 80 Volts for 1 sec
per MIL-STD-704A
Fault Tolerant Magnetic Feedback Circuit
NO Use of Optoisolators
Undervoltage Lockout
Short Circuit Protection
Current Limit Protection
Precision Projection Welded Hermetic Package
High Power Density
Custom Versions Available
Additional Environmental Screening Available
Meets MIL-STD-461 Revisions C, D, E and F
EMC Requirements When Used With VPT’s
EMI Filters
Flanged and Non-flanged Versions Available.
MIL-PRF-38534 Element Evaluated
Components
Figure 1
– DVAB2800D / DVAB2800DF DC-DC Converter
(Exact
marking may differ from that shown)
DVAB2800D-2.0
http://www.vptpower.com
Sales Information:
Phone: (425) 353-3010
Fax: (425) 353-4030
E-mail: vptsales@vptpower.com
1
DVAB2800D Series
SPECIFICATIONS
(T
CASE
= -55°C to +125°C, V
IN
= +28V ± 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous)
Input Voltage (Transient, 1 second)
Output Power
Power Dissipation (Full Load, T
CASE
= +125°C)
ESD Rating per MIL-PRF-38534
50 V
DC
80 Volts
15 Watts
7.0 Watts
3A
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum) (Un-Flanged / Flanged)
+15°C
-65°C to +150°C
270°C
(24 / 28) Grams
Parameter
Conditions
DVAB2805D
Min
Typ
Max
Min
DVAB2812D
Typ
Max
Units
STATIC
INPUT
Voltage
Current
Ripple Current
Inhibit Pin Input
UVLO Turn On
UVLO Turn Off
OUTPUT
Voltage
Power
1
4
4
4
Continuous
Transient , 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
4
15
-
-
-
-
0
12
10.5
8.5
28
-
2
20
25
-
14
-
-
5.0
5.0
-
-
-
25
1
4
77
-
650
750
-
393
50
80
5
60
60
1.5
17
14.5
13.5
5.05
5.075
15
7.5
1.5
60
20
50
-
500
700
800
-
-
15
-
-
-
-
0
12
10.5
8.5
11.88
11.82
0
0
0
-
-
-
73
-
550
700
100
-
28
-
2
20
25
-
14
-
-
12.0
12.0
-
-
-
20
1
2
80
-
650
750
-
393
50
80
5
60
60
1.5
17
14.5
13.5
12.12
12.18
15
7.5
0.625
60
20
50
-
500
700
800
-
-
V
V
mA
mA
mA
p-p
V
V
V
V
V
V
W
W
A
mV
p-p
mV
mV
%
F
kHz
kHz
MΩ
kHrs
Inhibit Pin Open Circuit Voltage
±V
OUT
±V
OUT
Total
±V
OUT
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
Either Output
Either Output
Full Load, 20Hz to 10MHz
V
IN
= 15V to 50V
No Load to Full Load
Full Load
Either Output
4.95
4.925
0
0
0
-
-
-
69
-
550
700
Current
1
±V
OUT
±V
OUT
±V
OUT
±V
OUT
Ripple Voltage
Line Regulation
Load Regulation
EFFICIENCY
CAPACITIVE LOAD
4
SWITCHING FREQUENCY
SYNCHRONIZATION FREQUENCY
ISOLATION
MTBF (MIL-HDBK-217F)
2
500 V
DC
, T
CASE
= 25°C
AIF @ T
C
= 55°C
±V
OUT
±V
OUT
±V
OUT
100
-
DYNAMIC
Load Step Output Transient
Load Step Recovery
Line Step Recovery
Turn On Delay
Turn On Overshoot
3
4
Half Load to Full Load
V
IN
= 16V to 40V
V
IN
= 0V to 28V
-
-
-
-
-
-
100
100
100
100
10
0
300
300
300
300
20
25
-
-
-
-
-
-
300
200
150
150
10
0
600
400
400
300
20
50
mV
PK
Sec
mV
PK
Sec
mSec
mV
PK
Line Step Output Transient
3, 4
Notes:
1.
2.
3.
4.
Derate linearly to 0 at 135°C.
Synchronization is TTL signal with V
SYNC MAX
= 6V.
Time for output voltage to settle within 1% of its nominal value.
Verified by qualification testing.
DVAB2800D-2.0
2
DVAB2800D Series
SPECIFICATIONS
(T
CASE
= -55°C to +125°C, V
IN
= +28V ± 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous)
Input Voltage (Transient, 1 second)
Output Power
Power Dissipation (Full Load, T
CASE
= +125°C)
ESD Rating per MIL-PRF-38534
50 V
DC
80 Volts
15 Watts
7.0 Watts
3A
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum) (Un-Flanged / Flanged)
+15°C
-65°C to +150°C
270°C
(24 / 28) Grams
Parameter
Conditions
DVAB2815D
Min
Typ
Max
Units
STATIC
INPUT
Voltage
Current
Ripple Current
Inhibit Pin Input
UVLO Turn On
UVLO Turn Off
OUTPUT
Voltage
Power
1
4
4
4
Continuous
Transient , 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
4
15
-
-
-
-
0
12
10.5
8.5
28
-
2
25
25
-
14
-
-
15.0
15.0
-
-
-
20
1
2
80
-
-
650
750
-
393
50
80
5
60
60
1.5
17
14.5
13.5
15.15
15.225
15
7.5
0.5
60
20
50
-
12
500
700
800
-
-
V
V
mA
mA
mA
p-p
V
V
V
V
V
V
W
W
A
mV
p-p
mV
mV
%
W
F
kHz
kHz
MΩ
kHrs
Inhibit Pin Open Circuit Voltage
±V
OUT
±V
OUT
Total
±V
OUT
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
Either Output
Either Output
Full Load, 20Hz to 10MHz
V
IN
= 15V to 50V
No Load to Full Load
Full Load
Short Circuit
Either Output
14.85
14.775
0
0
0
-
-
-
73
-
-
550
700
Current
1
±V
OUT
±V
OUT
±V
OUT
±V
OUT
4
Ripple Voltage
Line Regulation
Load Regulation
EFFICIENCY
FAULT POWER DISSIPATION
CAPACITIVE LOAD
4
SWITCHING FREQUENCY
SYNCHRONIZATION FREQUENCY
ISOLATION
MTBF (MIL-HDBK-217F)
2
500 V
DC
, T
CASE
= 25°C
AIF @ T
C
= 55°C
±V
OUT
±V
OUT
±V
OUT
100
-
DYNAMIC
Load Step Output Transient
Load Step Recovery
Line Step Recovery
Turn On Delay
Turn On Overshoot
3
4
Half Load to Full Load
V
IN
= 15V to 50V
V
IN
= 0V to 28V
-
-
-
-
-
-
350
200
200
100
10
0
600
400
500
300
20
50
mV
PK
Sec
mV
PK
Sec
mSec
mV
PK
Line Step Output Transient
3, 4
Notes:
1.
2.
3.
4.
Derate linearly to 0 at 135°C.
Synchronization is TTL signal with V
SYNC MAX
= 6V.
Time for output voltage to settle within 1% of its nominal value.
Verified by qualification testing.
DVAB2800D-2.0
3
DVAB2800D Series
BLOCK DIAGRAM
28V IN
PIN 9
+VOUT
PIN 2
OUT COM
PIN 3
IN COM
PIN 8
SYNC
PIN 7
PRIMARY
HOUSEKEEPING
SUPPLY
DUAL PWM
CONTROLLER
-VOUT
PIN 4
TRANSFORMER
ISOLATED
ERROR SIGNAL
FEEDBACK
VOLTAGE
ERROR
AMPLIFIERS
TRANSFORMER
ISOLATED
POWER
FEEDFORWARD
INH
PIN 1
SECONDARY
HOUSKEEPING
SUPPLY
Figure 2
DVAB2800D-2.0
4
DVAB2800D Series
CONNECTION DIAGRAM
Figure 3
INHIBIT DRIVE CONNECTION DIAGRAMS
28V IN 9
15K
INH
1
BIAS
OPTIONAL
CAPACITOR
IN COM 8
14V
OPTOISOLATOR
28V IN 9
15K
INH
1
BIAS
OPTIONAL
CAPACITOR
IN COM 8
14V
Figure 4
– Internal Inhibit Circuit and Recommended Drive
(Shown with optional capacitor for turn-on delay)
Figure 5
– Isolated Inhibit Drive
(Shown with optional capacitor for turn-on delay)
DVAB2800D-2.0
5
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